Inverse binomial transform of the beta numbers 1/beta(n+1,n+1) (A002457).

Terms

a(0) =1a(1) =5a(2) =19a(3) =67a(4) =227a(5) =751a(6) =2445a(7) =7869a(8) =25107a(9) =79567a(10) =250793a(11) =786985a(12) =2460397a(13) =7667921a(14) =23832931a(15) =73902627a(16) =228692115a(17) =706407903a(18) =2178511449a(19) =6708684009a(20) =20632428249a(21) =63380014845a(22) =194486530791a(23) =596213956023